For richer or poorer: diatoms as indicators of biological condition across a gradient of boreal fen types

IF 2.2 3区 生物学 Q1 MARINE & FRESHWATER BIOLOGY
Cassandra R. Araujo, Kevin H. Wyatt, Allison R. Rober
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Abstract

The goals of this study were to (1) document spatial and temporal variation in diatom species composition across a gradient of northern peatlands and (2) determine how underlying environmental conditions influence diatom species distribution. We sampled three peatlands (a rich, moderate, and poor fen) in interior Alaska during a growing season (May until August). A total of 100 species were observed across all fens, 17 of which were present at > 1% relative abundance, and 15 were selected as indicator species. Based on the differential response of Simpson vs. Shannon diversity metrics, we determined that fen type affected diatom assemblage composition and differences were driven by changes in the most common, but not in the least common species. Diatom species richness declined along a gradient of rich to poor fens. Conductivity, dissolved organic carbon concentration, water temperature, pH, and water depth explained 63% of the total variation in diatom assemblage structure among fens. We identified unique indicator species associated with each fen that either reinforced or expanded current understanding of their environmental thresholds. These results indicate that variation in environmental conditions in boreal fens will be reflected in diatom assemblages, which may be used to monitor biological condition in these ecosystems.

Abstract Image

富裕或贫穷:硅藻作为北方沼泽类型梯度的生物状况指标
本研究的目标是:(1) 记录北部泥炭地硅藻物种组成梯度的时空变化;(2) 确定基本环境条件如何影响硅藻物种分布。我们在生长季节(5 月至 8 月)对阿拉斯加内陆的三个泥炭地(富饶、中等和贫瘠的沼泽)进行了采样。在所有沼泽中总共观察到 100 个物种,其中 17 个物种的相对丰度为 >1%,15 个物种被选为指示物种。根据辛普森(Simpson)与香农(Shannon)多样性指标的不同反应,我们确定沼泽类型会影响硅藻群的组成,差异是由最常见物种的变化而非最不常见物种的变化造成的。硅藻物种丰富度沿着从富饶沼泽到贫瘠沼泽的梯度下降。电导率、溶解有机碳浓度、水温、pH 值和水深解释了沼泽地硅藻群结构总变化的 63%。我们确定了与每个沼泽相关的独特指示物种,这些物种加强或扩大了目前对其环境阈值的理解。这些结果表明,北方沼泽地环境条件的变化将反映在硅藻群中,硅藻群可用于监测这些生态系统的生物状况。
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来源期刊
Hydrobiologia
Hydrobiologia 生物-海洋与淡水生物学
CiteScore
5.40
自引率
11.50%
发文量
288
审稿时长
4.9 months
期刊介绍: Hydrobiologia publishes original research, reviews and opinions regarding the biology of all aquatic environments, including the impact of human activities. We welcome molecular-, organism-, community- and ecosystem-level studies in contributions dealing with limnology and oceanography, including systematics and aquatic ecology. Hypothesis-driven experimental research is preferred, but also theoretical papers or articles with large descriptive content will be considered, provided they are made relevant to a broad hydrobiological audience. Applied aspects will be considered if firmly embedded in an ecological context.
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